Refactor code to use String::new

[HelloShiv]

• Issue mentioned in Fix clippy warning empty String is being created manually #224

[codecov]

Codecov Report

Merging #237 (696e947) into main (a1ae326) will increase coverage by 0.28%.
The diff coverage is 0.00%.

❗ Current head 696e947 differs from pull request most recent head 6a065f7. Consider uploading reports for the commit 6a065f7 to get more accurate results

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   58.60%   58.88%   +0.28%     
==========================================
  Files          30       30              
  Lines        3544     3544              
  Branches      785      783       -2     
==========================================
+ Hits         2077     2087      +10     
  Misses       1165     1165              
+ Partials      302      292      -10     

Impacted Files	Coverage Δ
src/find/matchers/printf.rs	70.62% <0.00%> (ø)

... and 1 file with indirect coverage changes

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